PULMONATA, 81 
The fossil species are very few. Two only have hitherto been described ; both from 
the Pleiocene formations, and both referred to living forms, viz., S. putris and S. oblonga, 
from the Mammaliferous Crag, (Wood’s ‘ Crag. Moll.,’ p. 5). The latter species is also 
given by M. Nyst, (Coq. Foss. de Belg.,’ p. 446,) as occurring in the corresponding 
formation in Belgium. 
No. 29. SuccrneA rmpERspicua. SS. Wood. Tab. XI, fig. 3a—d. 
S. mrerspicua, S. Wood. 1847. Lond. Geol. Jour., vol.i, p. 118. 
S. testd ovatd, ventricosd, tenui, levi; spird brevissimd, obtusa : anfractibus tribus, 
convexis, ad suturam sub-depressis: apertura rotundato-ovatd, sub-verticali, bessem totius 
teste in longitudinem superanti. 
This exceedingly rare shell is thin, smooth, ovate, and composed of three 
ventricose volutions, rather depressed at the suture. The spire is very short and 
obtuse ; the aperture large, nearly vertical, and in length fully equal to two thirds of 
the whole shell. 
I have three specimens only of this shell: two from Hordwell, for which I am 
indebted to Mr. S. Wood; the third is from Headon Hill. 
Size.—Axis rather more than 2-10ths of an inch; diameter, 3-10ths of an inch. 
Section PB. Aguatica, Fleming. 
Limnopuita, Hartm. 
HyeGropuita, Féruss. 
Family—LiMn 21D 2. 
Genus 12th. Limnama.* Zamarch. 
Buccrinvn, (sp.,) Miiller, 1774. 
Buiimvs, (sp.,) Scopoli, 1777 ; Bruguiére, 1792. 
Lymnea, Lamarck, 1801; Risso, 1826; Valenc., 1833. 
Limnevs, Draparnaud, 1805; Brogniart, 1810. 
Lymnevs, Brard, 1809; D’Ord., 1841. 
Lymnus, Montfort, 1810. 
Loin, De Férussac, 1821; Nillson, 1822; Grateloup, 1838; Bronn, 1838. 
Limnavus, Oken, 1815; Rossmasler, 1835; Turton, 1831. 
Staenicoia, Leach, 1820. 
Guinaria, Leach, 1820. 
* Etym., Acuvaios, belonging to, or growing in, pools or marshes. 
lt 
